how long do cats hate each other?

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When you bring another cat into your house, the new cat should be kept in a separate room for at least a week. The cats need time to invesitage each other's sounds and scents without being exposed to each other. Most often, when a kitten is brought in to be introduced to the resident cat, the resident, older cat will let the youngster know exactly what behavior is acceptable or not. There's hissing, growling and swatting until the kid gets the message. Now, if your female is outright "attacking" the kitten and there is screaming, fur flying, etc., you still need to separate them and see if a time apart will smooth ruffled fur. If not neutered, the male needs to be. Ask your vet, who knows your little old lady, what the best way is to regain peace in your household.